The is a Japanese 2-8-4 Berkshire wheel arrangement steam locomotive type created by rebuilding an earlier class to suit postwar requirements. 78 of the 380 successful, powerful prewar Class D50 2-8-2 Mikado locomotives were rebuilt and redesigned as D60s between 1951 and 1956 by Hideo Shima at the JNR Hamamatsu (Nagoya) Region, Nagano, (Nagoya) Region, and Tsuchizaki, (Sendai) Region workshops. As with the rebuilding of Class D51 to Class D61 and Class D52 to Class D62 locomotives, an additional trailing axle was included to reduce the heavy axle load of the D50 and allow more widespread use. The cylinder diameter was reduced from 570 mm on the D50s to 550 mm to minimize wheel spin, and they were built to replace the older Class 9600s in 1951. The D60s have a top speed of 80 km/h (50 mph).
The spread of electrification and increasing numbers of diesel locomotives resulted in the first D60s being withdrawn from 1966. A few examples based at Wakamatsu Depot soldiered on, hauling coal trains on the Chikuhō Mainline in northern Kyushu, and the last member of the class (D60 61) was finally withdrawn in August 1974. Four have been preserved while the remainder were scrapped.
| Overall length | 20,030 mm | |
|---|---|---|
| Overall height | 3,955 mm | |
| Driving wheel diameter | 1,400 mm | |
| Total operating weight | 81.56 t (excluding tender) | |
| Boiler pressure | 13.0 kgf/cm² (1.27 MPa | |
| Cylinder dimensions | 550 mm dia. x 660 mm stroke |
| Numbers | Former numbers | Rebuilt at | Date | |
|---|---|---|---|---|
| D60 1-D60 10 | D50 162/D50 44/D50 305/D50 116/D50 169/D50 199/D50 81/D50 168/D50 47/D50 211 | JNR Hamamatsu Works | Originally built as Class D50 2-8-2 in 1925-1927. Rebuilt 1951. Retired 1966-1967 | |
| D60 11-D60 28 | D50 14/D50 175/D50 202/D50 225/D50 123/D50 71/D50 127/D50 226/D50 244/D50 163/D50 133/D50 85/D50 88/D50 337/D50 289/D50 106/D50 237/D50 306 | JNR Hamamatsu Works | Originally built as Class D50 2-8-2 in 1925-1928. Rebuilt 1952.Retired 1968-1969 | |
| D60 29-D60 30 | D50 112/D50 65 | JNR Hamamatsu Works | Originally built as Class D50 2-8-2 in 1925-1926. Rebuilt 1953. Retired 1969-1970 | |
| D60 31-D60 34 | D50 302/D50 73/D50 317/D50 145 | JNR Nagano Works | Originally built as Class D50 2-8-2 in 1925-1929. Rebuilt 1952. Retired 1970 | |
| D60 35-D60 39 | D50 149/D50 141/D50 160/D50 126/D50 216 | JNR Nagano Works | Originally built as Class D50 2-8-2 in 1926-1927. Rebuilt 1953. Retired 1971 | |
| D60 40-D60 44 | D50 128/D50 333/D50 248/D50 113/D50 31 | JNR Hamamatsu Works | Originally built as Class D50 2-8-2 in 1924-1929. Rebuilt 1953. Retired 1971-1972 | |
| D60 45-D60 62 | D50 32/D50 157/D50 326/D50 35/D50 247/D50 159/D50 354/D50 192/D50 34/D50 51/D50 99/D50 265/D50 40/D50 197/D50 120/D50 152/D50 282/D50 229 | JNR Hamamatsu Works | Originally built as Class D50 2-8-2 in 1924-1930. Rebuilt 1954. Retired 1972-1974 | |
| D60 63-D60 69 | D50 351/D50 283/D50 191/D50 36/D50 228/D50 136/D50 33 | JNR Hamamatsu Works | Originally built as Class D50 2-8-2 in 1924-1930. Rebuilt 1955. Retired 1973-1974 | |
| D60 70 | D50 111 | JNR Nagano Works | Originally built as Class D50 2-8-2 in 1926. Rebuilt 1955. Retired 1973-1974 | |
| D60 71-D60 72 | D50 95/D50 93 | JNR Tsuchizaki Works | Originally built as Class D50 2-8-2 in 1925. Rebuilt 1955. Retired 1973-1974 | |
| D60 73 | D50 278 | JNR Nagano Works | Originally built as Class D50 2-8-2 in 1928. Rebuilt 1956. Retired 1973-1974 | |
| D60 74-D60 75 | D50 57/D50 91 | JNR Tsuchizaki Works | Originally built as Class D50 2-8-2 in 1925. Rebuilt 1955. Retired 1974 | |
| D60 76-D60 78 | D50 96/D50 219/D50 67 | JNR Hamamatsu Works | Originally built as Class D50 2-8-2 in 1925-1927. Rebuilt 1956. Retired 1974 |